Hoisting apparatus



Feb. 12, 1929. 1,701,939

9 c. zErTERLuN'D 1 HOISTING APPARATUS Filed Dec. 4, 1926 3 Sheets-Sheetl Feb. 12, 1929. 1,701,939

c. zET'n-:RLUND HOISTING APPARATUS Filed Dec. 4, 1926 5 Sheets-Sheet 2gm, Wig.,

Feb. l2, 1929.. 9 1,701,939

c. zBTTt-:RLUND Horsrme APPARATUS filed Dec. 4. 1926 5 Sheets-Sheet 3 ilIllllflll Patented Feb. 12, 1929.

UNITED STATES 1,791,939 PATENT' oFFlcE.

CAR-L ZETTERLUND, or CHICAGO, ILLrNoIs. Y

HOISTING APPARATUS.

Application filed December`4, 1926. Serial No. 152,524.`

My invention relates broadly to hoists or elevating machines usedparticularly for elevating building material and similar objects tohigher levels, sayin the construct-ion of buildings, and has` particularreference to a machine of this type, which is automatic in the operationof stopping the platforms or cages when reaching a predetermined level.While I shall describe my invention as beloing particularly adaptablefor elevating building material and similar objects in the constructionof a building and automatic in the manner above described, it will beunderstood that my invention may be used for elevating other objects,whether of similar or dissimilar nature, while on the other hand, it mayembody certain features of novelty hereinafter disclosed without beingautomatic in the operation of stopping the movement of the platformswhen reaching the desired level.

VThe principal object of the invention is to provide a novel form ofmechanism Vfor controlling, clutching and releasing a cablen windingdrum whereby it will alternately elevate and lower a pair of elevatorsor cages of the apparatus, said operation being controlled at a pointremote from the drum.

Other objects and advantages of the invention will be apparent from thefollowing detailed description when taken in connection with theaccompanying drawings which form a part thereof.

In the drawings:

Figure 1 is a side elevation of a machine embodying my invention;

Fig. 2 is a top plan view of the same;

Fig. 3 is a view taken on line Bw of Fig. 2;

Fig. 4 is a detailed view looking at one end of the drum;

Fig. 5 is an enlarged sectional view of oneof the clutching elementscomprising the reversing mechanism;

. Fig. G is a fragmentary sectional view taken vertically through thecenter of the drum as shown in Fig. 3; and Fig. 7 is a detailed view ofa portion of one of the clutch ing elements.

Y Referring more particularly to the drawings wherein I have shown apreferred einbodiment of my invention, a base 10 is adaptyed to carrythe uprights or standards 11, which are connected at the top by a crossmember 12. A central standard 13 is likem1 wise suitably carried andconnected at its top to creas member 12 and between these storied:f

ards the elevator cages or platforms 14 and 15 are guided for operation.lllhe standards comprise the main supporting frames of the platforms,which frames may be of any suitable size, form and material, butpreferably of wood or metal and of a height capable of reaching thedesired level to which the platforms are to be elevated, in someinstances to ten or more stories, which is quite common in theconstruction of modern sky Scrapers. Supported by a top cross member 12are the sheaves 16 andl 17, about which the ends of a cable 18 aretrained for connection to said platforms 14 and `15. This cable isadapted alternately to raise and lower the platforms, and, as aconsequence, when one end of the cable is being wound upon a drum 19,the other end is being released, which action results in the raising ofone of the platforms and in the lowering of the other.

It is apparent from Figs. 1 and 2 that both strands of cable 18 extenddownwardly and under a double grooved pulley 2O suitably supported onbase 110, from where `said' strands are wound in the usual manner arounddrum 19.

The power for operating drum 19 and for providing alternate vrotation tolower and raise the platforms in proper sequence is obtained through areversing mechanism carried by a continuously driven power shaft 21.This power shaft may extend from any suitable source, as at 29, and isadapted to carry at its outer end a gear 22 meshing with a pair oflarger gears 23 and 24. These gears are splined to shafts 25 and 26 attheir inner ends. V

' A U-frame 27, mounted on base 10, is adapted to support near the upperends of its legs a transverse shaft 30. A ring gear 31 is carried onshaft 30. At one side of this gear, the drum 19 is suitably fastened soas to be driven thereby from a reversing mechanism disposed below onshafts 25 and 26. The shafts are suitably journaled in one of the wallsof frame 27. Clutching elements 34 and 35 are carried by said shafts onthe ends projecting into and through housing 27.

Both clutching elements 34 and 35 are substantially the same inconstruction. By referring to Fig. 5, it will be noted that clutchingelement 35 comprises a rotatable frame 36 splined to shaft 26, whichframe is provided with a pair of outwardly extending parallel lugs 37and apertured to receive a spring pressed pin Rib A pulley 4@ mirriedagainst llt) c end of pin v39 whereby'the,rotation of the theoutsidetace of lug 37 on pin 39 and is adapted to be rotated by a control cable41.

The opposite end of pin 39 may be provided in f the form of a latchprotruding from lugf38.

Between frame 36 andA frame 2.7, 'a loosely mounted gear 42 is carriedon shaft 26.' Gear .42 is constantly in mesh with ring gear 31 on Gear42 is provided with an eX- drum 19. tendedhub 43 from which extends aprojectmg lug 44. Lug 44 lies in the path ofthe latch clutching element`willbring the pin into engagement witlrlug 44 to drive gear 42.V

Shafts 25 and 26 rotate, ol` course, in opposite directions, due tobeing driven by the gear 22 on power shalt 21. Clutching elements-84and- 35' will also rotate `in opposite di* rec'tions. By forming the-endof pin 39 as a latch, either clutching element may rotateV Withoutdrivingits'cooperating lug 44 on geaisi42.v lt will be observed thatthis latch end orF ,each` pin 39 is tarnished with a groove 47 Pins39may be rotated to present-groove 47 to the lugs so aste drive thegears 42: On theother hand, theymay be rotated to present theslantingface. 48 to the lugs 44, so vthat as :the same engages the lugs,

the pins willbe displaced againstthe action of springs 59.

As beforelmentio-ned, awcontrol cable 41 Vis urnislied'for theclutch'element 35. Asimilar controlcable -50 is furnishedtor theclutchelement-34; r'hese cables lead to a pair of pulley 54 disposed ad]-acentto the clutching element as :Well as by a second pulley-5 5.` Frenithis point, the cable extends horizontally towardsthe clutch element andaboutja rollerjpin 56 to permit it to encircle pulley 40.

The cableis liXed to pulley 40. As the cableV is pulledY upwardly, thepulley Will rotate inthe direction of the arrow` as shovvn in Fig. Suchrotation of the pulley140'will rotate the pin sov that the groove 47 inthe latch end thereof` will be turned away from the lug- 44, therebypresentingV the angular face 4S thereto so as to cause this pin to bedisplaced as it rotatespastgthe-lug. Such action disengagesthe clutchelement 35 from its gear 42 and disconnects the ldrivejirom the drum19;lNith bothV levers 51 r tripped1 upwardly, the h oist will loefinvneutral position and the drum 19v will not rotate to raise and lowereither platform.

To start the hoist operating, one ol the platforms is loaded.Theworkinan al; the high level then manually operates one ol the levers51 or` 52,;whereby the cooperating control cable 41 or 50 will bereleased to allow the clutch pin of one of the clutching elements topresent its groove 47 to the lu i. its long as the control cables areheld taut, the clutch pins will be held against rotation by the Atensionol coil springs 59. Placing slaclr in either control cable will,however, allow the corresponding spring 59 to return one of the pins toa position presenting its groove 47 to lug 4l. Drum 19 will now bedriven in either direction, depending on the clutch element cngaged.

lvleans'may beprovided to lool: drum 1) against reverserotation andthereby to loelithe elevator platforms against slipping, when. it isdesired to hold either platform at acertain level.r This mechanismcomprises a jack pawl G0 pivotally mounted on the :trame 2T, as shown inFigs. 8 and G. Jack pawl G0 is ot- `the double acting type, having`opposed fingers G3 and G4. on opposite sides ot its pivot 65,alternately engaging teeth G1, so as toy prevent back rotation o'i'thedrum 19 during the tiniewhen either clutching element may be in drivingrelation with the drum. Accordingly. a control is provided `foroperating the j ack pand. which is governed by the particular controlcable released. Il control cable 41 is released to place clutch element85 in driving relation with the drum, a pivoted lever GT attached to thecablelat 68 swings downwardly about its pivot point 69, whereby to raisethe inner end of the lever 67 as shown at 70 in Fig. l, so as to releaseingeral oi the jack pavvl (ill and engage-iinger with teeth 61 on theopposite side of the pivot G5. Consequently, reverse rotation oi? drum19, while clutch ele ment 35 drives the drum, is ynevented. liever G7 isnormally urged down .vardly by a spring` 71 having its lower endattached to a laterally projecting lug 72, carried on traine 27. lpreiier toprovide the jack pawl (i0 with ay positive snap action,whereby to assure engagement of either pawl G3 or G4 when the other-isreleased. To accomplish this end, a lug 74 extends upwardly from the'ack pa wl on the inside of irame 2'? and passes through aslot' in thisframe so as to coope ate with a snap-over spring. G attached to a. point7'? on the outside tace of traine. 2'?. il. lever TS1, similar to lever67, is turnishenl 'for control cable and serves to throw therpawl (i0 tothe opposite side oli its center when cable .'30 is released.

Each of fthe levers may have a segment 8U associated therewith to beengaged by a ratchet pawl 81 carried; by a manually oper-- ated arm 82.Torelease either lever nl or 52 after they'arei'moved to upper position.the

lll!) lllfi laborer grips arm 82 so as to disengage pawl 81 from segment80.

sume that the machine is about to be operated to raise and lowerplatforms 14 and 15 in their proper order. The workman operates the arm82 to disengage the pawl 81, whereupon either control cable 41 or 50 isreleased to allow the corresponding clutching element to engage thedrive. The drum 19 will rotate in either direction according to theclutching element engaged. The elevator platforms 14 and 15 will then beraised and lowered in alternative relation. When the ascending platformapproaches the desired level, it will trip one of the levers. The driveshaft 21 is thereby automatically disengaged and the operation of thehoist stopped. The clutching elements will remain in neutral positionduring disengagement of the drive shaft and will not again place it indriving` relation with the drum 19 until the opposite lever is manuallyreleased. Thus, the operati on of the hoist is automatically stopped bythe attainment of high level by one of the platforms and is manuallystarted again by actuation of one of the levers at the high level.

Without futher elaboration, the foregoing will so fully explain the gistof my invention that others may, by applying current knowledge, readlyadapt the same for use under various conditions of service withouteliminating certain features which may properly be said to constitutethe essential elements of novelty involved, which items are intended tobe described and secured to me by the following claims.

` I claim: Y I

1. In a hoist of the type described including a plurality of platforms,the combination of a continuously operated drive shaft, a drum, cablesleading fromA said drum to said platforms, reversing mechanism betweensaid drive shaft and said drum, means for controlling said reversingmechanism according to the position of saidv platforms, said reversingmechanism including a pair of clutching elements, one for each platform,

said clutching elements being in constantV driving relation with saiddrive shaft and held out of engagement with said drum until released bysaid controlling means.

2. In a hoist of the type described including a plurality of platforms,the combination of a continuously operated drive shaft,

Va drum, cables leading from said drum to said platforms, reversingmechanism between said drive shaft and said drums, said reversingmechanism including a pair of spring pressed clutching elements and anoperative connection between each clutching element and a point in thepath of travel of each platform, said connections serving alternately torelease said clutching elements whereby to engage saiddrum for drivingthe same alternately inlopposite directions.

3. In a hoist of the type described includinga plurality of platforms,the combination of a continuously operated drive shaft, a drum, cablesleading from said drum to said platforms, a clutching element for eachplatform, a control element foreach platform, cables leading from saidclutching elements to said control elements, said control elements beingmanually operable to cause said clutching elements alternately to engagesaid drum and automatically operable to disengage said clutchingelements, said clutching elements being constantly driven by said driveshaft.

4. In a hoist of the type described including a plurality of platforms,the combina- .tion of a continuously operated drive shaft,

a drum, driving connections leading from said drum to said platforms,control elements for automatically stopping said platforms when reachinga predetermined level, said control elements including lever mechanism,flexible connections leading therefrom, and a reversing mechanismbetween said drum and said driving shaft including gearing and twoclutching elements connected to said flexible connections andalternately connecting said drum to said driving shaft for oppositerotation.

5. In a hoist of the type described including a plurality of platforms,the combination of a continuously operated drive shaft, a drum, cablesleading from said drum to said platforms, and means for connecting saiddrum to said drive shaft for opposite rotation comprising oppositelyrotating shafts in constant driving relation with said drive shaft, anda spring pressed clutching element fixed to each shaft to be rotatabletherewith, loosely mounted gears on said shafts, a ring gear attached tosaid drum and in mesh with said gears, lugs projecting from said gearsin the paths of said-pins, and control means for revolving saidclutching elements whereby either to permit driving engagement with saidlugs or to permit displacement thereby.

6. In a hoist of the type described including a plurality of platforms,the combination of a continuo'usly operated drive shaft, a drum, drivingconnections leading from said drum to said platforms, continuously ro-4tatingdisplaceable clutching elements driven by said drive shaft, meansfor alternately placing either clutching element in driving relationwith said drum including engageable lugs adapted to alternately displaceeither clutching element as the other clutching element is in engagementto drive said drum.

7. In a hoist of the type described including a plurality of platforms,the combination of a continuously operated drive shaft, a drum, drivingconnections leading from said drum` to said rplatformgf means `forintercom nectingsaiddruirlV *ce* Said drive :shaft lfor a1- terna'e'rotatlonof said drum including a ring gear andclutchingeleinentsfaiternately ringgeer,I teeth formed about the innerperiphery of said drum, and a, double acting pri-W1 device forengagement with said teeth tovprevent accidental reverse rotation of thedrum when driven in either direction.

In Witness whereof, I have hereunto subscribed my name.

CARL ZETTERLUND,

